Exact Matching Concepts from Other Schemes

Earlier Established Forms

Sources

found: Wikipedia www site, 18 June 2013:Avvakum (Avvakum Petrov, born 1620 or 1621 in Grigorovo; died 16 April 1682 in Pustozyorsk; Russian protopope of Kazan Cathedral; his autobiography and letters to the tsar and other old believers are considered masterpieces of 17th century Russian literature)